Honestly I'm not to sure about the PA50I, I was just going off of what the original dealer told me, which was that it would bolt up to any hobbit. I see what your talking about on the Wiki. If someone with a PA50I shows interest I'll be sure to measure the header before I sell it (maybe I'll do it anyway just to share the knowledge). Thanks for the info.
I should also note that on the NU50 you will have to remove the center stand.